1
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Salpekar D, Serles P, Colas G, Ma L, Yadav S, Hamidinejad M, Khabashesku VN, Gao G, Swaminathan V, Vajtai R, Singh CV, Park C, Filleter T, Meiyazhagan A, Ajayan PM. Multifunctional Applications Enabled by Fluorination of Hexagonal Boron Nitride. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2311836. [PMID: 38770997 DOI: 10.1002/smll.202311836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 05/03/2024] [Indexed: 05/22/2024]
Abstract
2D materials exhibit exceptional properties as compared to their macroscopic counterparts, with promising applications in nearly every area of science and technology. To unlock further functionality, the chemical functionalization of 2D structures is a powerful technique that enables tunability and new properties within these materials. Here, the successful effort to chemically functionalize hexagonal boron nitride (hBN), a chemically inert 2D ceramic with weak interlayer forces, using a gas-phase fluorination process is exploited. The fluorine functionalization guides interlayer expansion and increased polar surface charges on the hBN sheets resulting in a number of vastly improved applications. Specifically, the F-hBN exhibits enhanced dispersibility and thermal conductivity at higher temperatures by more than 75% offering exceptional performance as a thermofluid additive. Dispersion of low volumes of F-hBN in lubricating oils also offers marked improvements in lubrication and wear resistance for steel tribological contacts decreasing friction by 31% and wear by 71%. Additionally, incorporating numerous negatively charged fluorine atoms on hBN induces a permanent dipole moment, demonstrating its applicability in microelectronic device applications. The findings suggest that anchoring chemical functionalities to hBN moieties improves a variety of properties for h-BN, making it suitable for numerous other applications such as fillers or reinforcement agents and developing high-performance composite structures.
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Affiliation(s)
- Devashish Salpekar
- Department of Materials Science & NanoEngineering, Rice University, 6100 Main Street, Houston, TX, 77005, USA
| | - Peter Serles
- Department of Mechanical & Industrial Engineering, The University of Toronto, 5 King's College Road, Toronto, ON, M5S 3G8, Canada
| | - Guillaume Colas
- Université de Franche-Comté, CNRS, institut FEMTO-ST, Besançon, F-25000, France
| | - Li Ma
- Department of Mechanical & Industrial Engineering, The University of Toronto, 5 King's College Road, Toronto, ON, M5S 3G8, Canada
| | - Shwetank Yadav
- Department of Materials Science and Engineering, University of Toronto, 184 College St, Toronto, ON, M5S 3E4, Canada
| | - Mahdi Hamidinejad
- Department of Engineering, University of Cambridge, Cambridge, CB30FS, UK
- Department of Mechanical Engineering, University of Alberta, 9211-116 Street NW, Edmonton, AB, T6G1H9, Canada
| | - Valery N Khabashesku
- Department of Materials Science & NanoEngineering, Rice University, 6100 Main Street, Houston, TX, 77005, USA
| | - Guanhui Gao
- Department of Materials Science & NanoEngineering, Rice University, 6100 Main Street, Houston, TX, 77005, USA
| | - Venkataraman Swaminathan
- Department of Materials Science & NanoEngineering, Rice University, 6100 Main Street, Houston, TX, 77005, USA
| | - Robert Vajtai
- Department of Materials Science & NanoEngineering, Rice University, 6100 Main Street, Houston, TX, 77005, USA
| | - Chandra Veer Singh
- Department of Materials Science and Engineering, University of Toronto, 184 College St, Toronto, ON, M5S 3E4, Canada
| | - Chul Park
- Department of Mechanical & Industrial Engineering, The University of Toronto, 5 King's College Road, Toronto, ON, M5S 3G8, Canada
| | - Tobin Filleter
- Department of Mechanical & Industrial Engineering, The University of Toronto, 5 King's College Road, Toronto, ON, M5S 3G8, Canada
| | - AshokKumar Meiyazhagan
- Department of Materials Science & NanoEngineering, Rice University, 6100 Main Street, Houston, TX, 77005, USA
| | - Pulickel M Ajayan
- Department of Materials Science & NanoEngineering, Rice University, 6100 Main Street, Houston, TX, 77005, USA
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Ma L, Wei L, Hamidinejad M, Park CB. Layered polymer composite foams for broadband ultra-low reflectance EMI shielding: a computationally guided fabrication approach. MATERIALS HORIZONS 2023; 10:4423-4437. [PMID: 37486618 DOI: 10.1039/d3mh00632h] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
The development of layered polymer composites and foams offers a promising solution for achieving effective electromagnetic interference (EMI) shielding while minimizing secondary electromagnetic pollution. However, the current fabrication process is largely based on trial and error, with limited focus on optimizing geometry and microstructure. This often results in suboptimal electromagnetic wave reflection and the use of unnecessarily thick samples. In this study, an input impedance model was employed to guide the fabrication of layered PVDF composite foams. This approach optimized the void fraction (VF) and the thickness of each layer to achieve broadband low reflection. Moreover, hybrid heterostructures of SiCnw@MXene were incorporated into the PVDF composite foams as an absorption layer, while the conductive PVDF/CNT composite foams served as a shielding layer. Directed by theoretical computations, we found that combining 2.2 mm of PVDF/SiCnw@MXene composite foam (50% VF) and 1.6 mm of PVDF/CNT composite yielded EMI shielding effectiveness of 45 dB, with an average reflectivity (R) of 0.03 and an effective absorption bandwidth of 5.54 GHz (for R < 0.1) over the Ku-band (12.4-18 GHz). Importantly, the corresponding peak R was only 0.000017. Our work showcases a theoretically guided approach for developing absorption-dominant EMI shielding materials with broadband ultra-low reflection, paving the way for cutting-edge applications.
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Affiliation(s)
- Li Ma
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada.
| | - Linfeng Wei
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada.
| | - Mahdi Hamidinejad
- Department of Mechanical Engineering, University of Alberta, 9211-116 Street NW, Edmonton, AB T6G1H9, Canada.
- Department of Chemical and Materials Engineering, University of Alberta, 9211-116 Street NW, Edmonton, AB T6G1H9, Canada.
| | - Chul B Park
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada.
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3
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Pornea AG, Choi KI, Jung JH, Hanif Z, Kwak C, Kim J. Enhancement of Isotropic Heat Dissipation of Polymer Composites by Using Ternary Filler Systems Consisting of Boron Nitride Nanotubes, h-BN, and Al 2O 3. ACS OMEGA 2023; 8:24454-24466. [PMID: 37457480 PMCID: PMC10339413 DOI: 10.1021/acsomega.3c02246] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 06/19/2023] [Indexed: 07/18/2023]
Abstract
In this research article, a poly(dimethylsiloxane) (PDMS)-based composite was postulated adapting an interactive ternary filler system consisting of Al2O3, hexagonal boron nitride (h-BN), and boron nitride nanotubes (BNNT) to construct a continuous three-dimensional (3D) structure for thermal attenuation. Al2O3 was imposed as a main filler, while h-BN and BNNT were assimilated to form interconnected heat conduction pathways for effective thermal dissipation. The structured framework articulates a profound improvement in isotropic thermal conductivity considering both axial and radial heat dissipation. The presence of h-BN entails uniform heat distribution in a planar mode, eliminating the occurrence of hotspots, while BNNT constructed a connecting phonon pathway in various directions, which insinuates effective overall thermal transport. The generated ternary filler composites attained an isotropic ratio of 1.35 and a thermal conductivity of 7.50 W/mK, which is a 36-fold (∼3650%) increase compared to neat PDMS resin and almost 3-fold (∼297%) that of the Al2O3 unary filler composite and ∼53% that of its binary counterpart, partaking interfacial thermal gaps of ∼36.15 and ∼62.24% on practical heating performance relative to its counterparts. Moreover, the incorporation of BNNT on a traditional spherical and planar filler offers an advantage not only in thermal conductivity but also in thermal and structural stability. Improvement in thermal stability is stipulated due to a melting point (Tm) shift of ∼11 °C upon the assimilation of BNNT. Mechanical permeance reinforcement was also observed with the presence of BNNT, showcasing a 31.5% increase in tensile strength and a 53% increase in Young's modulus relative to the singular filler composite. This exploration administers a new insight into heat dissipation phenomena in polymeric composites and proposes a simple approach to their design and assembly.
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Affiliation(s)
- Arni Gesselle
M. Pornea
- R&D
Center, Naieel Technology, 6-2 Yuseongdaero 1205, 2nd FL, Daejeon 34104, Republic of Korea
| | - Ki-In Choi
- R&D
Center, Naieel Technology, 6-2 Yuseongdaero 1205, 2nd FL, Daejeon 34104, Republic of Korea
| | - Jung-Hwan Jung
- R&D
Center, Naieel Technology, 6-2 Yuseongdaero 1205, 2nd FL, Daejeon 34104, Republic of Korea
| | - Zahid Hanif
- R&D
Center, Naieel Technology, 6-2 Yuseongdaero 1205, 2nd FL, Daejeon 34104, Republic of Korea
| | - Cheolwoo Kwak
- CMT
Co., Ltd., 322 Teheran-ro,
Hanshin Intervalley 24 East Bldg., Gangnam-gu, Seoul 06211, Republic of Korea
| | - Jaewoo Kim
- R&D
Center, Naieel Technology, 6-2 Yuseongdaero 1205, 2nd FL, Daejeon 34104, Republic of Korea
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Qiao J, Qiao W, Gao H, Yang J, Li Z, Wang P, Cao C, Zhang J, Tang C, Xue Y. Highly Multifunctional Performances of Boron Nitride Nanosheets/Polydimethylsiloxane Composite Foams. ACS APPLIED MATERIALS & INTERFACES 2023; 15:5760-5773. [PMID: 36649561 DOI: 10.1021/acsami.2c18188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Although this kind of hexagonal boron nitride (h-BN)-filled polydimethylsiloxane (PDMS) multifunctional composite foam has been greatly expected, its development is still relatively slow as a result of the limitation of synthetic challenge. In this work, a new foaming process of BNNSs-PDMS, alcohol, and water three-phase emulsion system is employed to synthesize a series of high-quality BNNSs/PDMS composite foams (BSFs) filled with highly functional and uniformly distributed BNNSs. As a result of well-bonded interfaces between the BNNSs and PDMS, enhanced multiple functions of BSFs appeared. The BSFs can show complete resilience at a compressive strain of 90% and only 3.99% irreversible deformation after 100,000 compressing-releasing hyperelastic cycles at a strain of 60%. On the basis of their outstanding shape-memory properties, the maximum voltage value of compression-driven piezo-triboelectric (CDPT) responses of the BSFs is up to ∼20 V. Depending on the remarkable super-elastic and CDPT performances, the BSFs can be used for sensitive sensing of temperature difference and electromechanical responses. Also, in the range of 12-40 GHz, the BSF materials display ultralow dielectric constants between 1.1 and 1.4 with proper dielectric loss tangent values of <0.3 and exhibit an enhanced and broadened sound adsorption capacity ranging from 500 to 6500 Hz. Although BSFs have high porosities of >65%, their thermal conductivities can still reach up to 0.407 ± 0.039 W m-1 K-1. Moreover, the BSF materials display favorable thermal stability, obviously reduced coefficient of thermal expansion, and good flame retardancy. All of these properties render the BSFs as a new category of excellent multifunctional material.
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Affiliation(s)
- Jiaxiao Qiao
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
- Hebei Key Laboratory of Boron Nitride Micro- and Nano-Materials, Hebei University of Technology, Tianjin 300130, China
| | - Wei Qiao
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
- Hebei Key Laboratory of Boron Nitride Micro- and Nano-Materials, Hebei University of Technology, Tianjin 300130, China
| | - Hejun Gao
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
- Hebei Key Laboratory of Boron Nitride Micro- and Nano-Materials, Hebei University of Technology, Tianjin 300130, China
| | - JingWen Yang
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
- Hebei Key Laboratory of Boron Nitride Micro- and Nano-Materials, Hebei University of Technology, Tianjin 300130, China
| | - Zexia Li
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
- Hebei Key Laboratory of Boron Nitride Micro- and Nano-Materials, Hebei University of Technology, Tianjin 300130, China
| | - Peng Wang
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
- Hebei Key Laboratory of Boron Nitride Micro- and Nano-Materials, Hebei University of Technology, Tianjin 300130, China
| | - Chaochao Cao
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
- Hebei Key Laboratory of Boron Nitride Micro- and Nano-Materials, Hebei University of Technology, Tianjin 300130, China
| | - Jun Zhang
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
- Hebei Key Laboratory of Boron Nitride Micro- and Nano-Materials, Hebei University of Technology, Tianjin 300130, China
| | - Chengchun Tang
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
- Hebei Key Laboratory of Boron Nitride Micro- and Nano-Materials, Hebei University of Technology, Tianjin 300130, China
| | - Yanming Xue
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
- Hebei Key Laboratory of Boron Nitride Micro- and Nano-Materials, Hebei University of Technology, Tianjin 300130, China
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5
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Sansone ND, Razzaz Z, Salari M, Tuccitto AV, Aguiar R, Leroux M, Lee PC. Tailoring Multifunctional and Lightweight Hierarchical Hybrid Graphene Nanoplatelet and Glass Fiber Composites. ACS APPLIED MATERIALS & INTERFACES 2022; 14:40232-40246. [PMID: 36000496 DOI: 10.1021/acsami.2c11231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In this work, hybrid polypropylene (PP)-based composites reinforced with graphene nanoplatelets (GnPs) and glass fiber (GF) were fabricated by injection molding to elucidate how the hybrid approach can produce synergistic effects capable of achieving properties and functionalities not possible in biphasic composites. Synergism between the reinforcements translated to improved mechanical performance, which was attributed to the chemically and/or electrostatically assembled hierarchical structure that facilitates load transfer at the interface while simultaneously tailoring the crystalline microstructure of the matrix by inducing transcrystallization and β-crystal formation. It was demonstrated that there exists an optimal concentration of 0.5 wt % GnP, producing the greatest mechanical properties and synergistic effect, corresponding to the highest degree of crystallinity (∼6% greater than Neat PP) and peak formation of β-crystals within the PP matrix. The greatest synergistic effect was found to be ∼52 and ∼39% for the specific tensile strength and flexural strength, respectively. The same optimal concentration of GnPs was found to produce the highest synergistic effect for thermal conductivity of ∼68% due to the volume exclusion effect induced by the GFs combined with the higher crystallinity of the microstructure, promoting the formation of thermally conductive pathways. Ultimately, the mechanisms contributing to the synergistic effect presented in this work can be used to maximize the performance of hybrid composite systems, giving them the potential to be tailored for a variety of high-performance industrial applications to meet the rising demands for ultra-strong, thermally conductive, and lightweight materials.
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Affiliation(s)
- Nello D Sansone
- Multifunctional Composites Manufacturing Laboratory (MCML), Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto M5S 3G8, Canada
| | - Zahir Razzaz
- Multifunctional Composites Manufacturing Laboratory (MCML), Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto M5S 3G8, Canada
- Axiom Group Inc., 115 Mary Street, Aurora L4G 1G3, Canada
| | - Meysam Salari
- Multifunctional Composites Manufacturing Laboratory (MCML), Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto M5S 3G8, Canada
- Microcellular Plastics Manufacturing Laboratory (MPML), Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto M5S 3G8, Canada
| | - Anthony V Tuccitto
- Multifunctional Composites Manufacturing Laboratory (MCML), Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto M5S 3G8, Canada
- Microcellular Plastics Manufacturing Laboratory (MPML), Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto M5S 3G8, Canada
| | - Rafaela Aguiar
- Multifunctional Composites Manufacturing Laboratory (MCML), Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto M5S 3G8, Canada
| | - Matthew Leroux
- Axiom Group Inc., 115 Mary Street, Aurora L4G 1G3, Canada
| | - Patrick C Lee
- Multifunctional Composites Manufacturing Laboratory (MCML), Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto M5S 3G8, Canada
- Microcellular Plastics Manufacturing Laboratory (MPML), Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto M5S 3G8, Canada
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Improving Thermal Conductivity of Injection Molded Polycarbonate/Boron Nitride Composites by Incorporating Spherical Alumina Particles: The Influence of Alumina Particle Size. Polymers (Basel) 2022; 14:polym14173477. [PMID: 36080549 PMCID: PMC9460723 DOI: 10.3390/polym14173477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 08/18/2022] [Accepted: 08/24/2022] [Indexed: 12/01/2022] Open
Abstract
In this work, the influences of alumina (Al2O3) particle size and loading concentration on the properties of injection molded polycarbonate (PC)/boron nitride (BN)/Al2O3 composites were systematically studied. Results indicated that both in-plane and through-plane thermal conductivity of the ternary composites were significantly improved with the addition of spherical Al2O3 particles. In addition, the thermal conductivity of polymer composites increased significantly with increasing Al2O3 concentration and particle size, which were related to the following factors: (1) the presence of spherical Al2O3 particles altered the orientation state of flaky BN fillers that were in close proximity to Al2O3 particles (as confirmed by SEM observations and XRD analysis), which was believed crucial to improving the through-plane thermal conductivity of injection molded samples; (2) the presence of Al2O3 particles increased the filler packing density by bridging the uniformly distributed BN fillers within PC substrate, thereby leading to a significant enhancement of thermal conductivity. The in-plane and through-plane thermal conductivity of PC/50 μm-Al2O3 40 wt%/BN 20 wt% composites reached as high as 2.95 and 1.78 W/mK, which were 1183% and 710% higher than those of pure PC, respectively. The prepared polymer composites exhibited reasonable mechanical performance, and excellent electrical insulation properties and processability, which showed potential applications in advanced engineering fields that require both thermal conduction and electrical insulation properties.
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Bai Y, Zhou S, Lei X, Zou H, Liang M. Enhanced thermal conductivity of polycarbonate‐based composites by constructing a dense filler packing structure consisting of hybrid boron nitride and flake graphite. J Appl Polym Sci 2022. [DOI: 10.1002/app.52895] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Yang Bai
- The State Key Laboratory of Polymer Materials Engineering Polymer Research Institute, Sichuan University Chengdu China
| | - Shengtai Zhou
- The State Key Laboratory of Polymer Materials Engineering Polymer Research Institute, Sichuan University Chengdu China
| | - Xue Lei
- The State Key Laboratory of Polymer Materials Engineering Polymer Research Institute, Sichuan University Chengdu China
| | - Huawei Zou
- The State Key Laboratory of Polymer Materials Engineering Polymer Research Institute, Sichuan University Chengdu China
| | - Mei Liang
- The State Key Laboratory of Polymer Materials Engineering Polymer Research Institute, Sichuan University Chengdu China
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8
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Zhao L, Chen Z, Ren J, Yang L, Li Y, Wang Z, Ning W, Jia S. Synchronously improved thermal conductivity and dielectric constant for epoxy composites by introducing functionalized silicon carbide nanoparticles and boron nitride microspheres. J Colloid Interface Sci 2022; 627:205-214. [PMID: 35849854 DOI: 10.1016/j.jcis.2022.07.058] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 07/02/2022] [Accepted: 07/09/2022] [Indexed: 11/28/2022]
Abstract
Polymer-based dielectrics with high thermal conductivity and superb dielectric properties hold great promising for advanced electronic packaging and thermal management application. However, integrating these properties into a single material remains challenging due to their mutually exclusive physical connotations. Here, an ideal dielectric thermally conductive epoxy composite is successfully prepared by incorporating multiscale hybrid fillers of boron nitride microsphere (BNMS) and silicon dioxide coated silicon carbide nanoparticles (SiC@SiO2). In the resultant composites, the microscale BNMS serve as the principal building blocks to establish the thermally conductive network, while the nanoscale SiC@SiO2 as bridges to optimize the heat transfer and suppress the interfacial phonon scattering. In addition, the special core-shell nanoarchitecture of SiC@SiO2 can significantly impede the leakage current and generate a great deal of minicapacitors in the composites. Consequently, favorable thermal conductivity (0.76 W/mK) and dielectric constant (∼8.19) are simultaneously achieved in the BNMS/SiC@SiO2/Epoxy composites without compromising the dielectric loss (∼0.022). The strategy described in this study provides important insights into the design of high-performance dielectric composites by capitalizing on the merits of different particles.
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Affiliation(s)
- Lihua Zhao
- College of Electrical Engineering, Sichuan University, Chengdu 610065, China
| | - Zhijie Chen
- College of Electrical Engineering, Sichuan University, Chengdu 610065, China
| | - Junwen Ren
- College of Electrical Engineering, Sichuan University, Chengdu 610065, China.
| | - Lingyu Yang
- State Key Lab of the Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, PR China
| | - Yuchao Li
- School of Materials Science and Engineering, Liaocheng University, Liaocheng 252000, PR China
| | - Zhong Wang
- College of Electrical Engineering, Sichuan University, Chengdu 610065, China
| | - Wenjun Ning
- College of Electrical Engineering, Sichuan University, Chengdu 610065, China
| | - Shenli Jia
- College of Electrical Engineering, Sichuan University, Chengdu 610065, China; State Key Lab of the Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, PR China
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9
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Tong Z, Pecchia A, Yam C, Zhou L, Dumitrică T, Frauenheim T. Anisotropic Phononic and Electronic Thermal Transport in BeN 4. J Phys Chem Lett 2022; 13:4501-4505. [PMID: 35575731 DOI: 10.1021/acs.jpclett.2c01104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Beryllium polynitride (BeN4) has been recently synthesized under high-pressure conditions [Bykov et al. Phys. Rev. Lett. 2021, 126, 175501]. Its anisotropic lattice structure dependent on the applied pressure motivates exploration of its thermal transport properties with a theoretical framework that combines the Boltzmann transport equation with ab initio calculations. The bonding anisotropy (impacting the phonon and electron group velocities) and bonding anharmonicity (captured through three- and four-phonon scatterings) are reflected in the strong anisotropy of both phononic and electronic components of the thermal conductivity. Moreover, the pressure-driven evolution of the interlayer Be-N bonding, from partially covalent (under high-pressure synthesis conditions) to van der Waals (under ambient pressure), drives a largely interlayer thermal conductivity. These findings highlight an alternative strategy for achieving directional control of the thermal transport in synthetic materials.
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Affiliation(s)
- Zhen Tong
- Shenzhen JL Computational Science and Applied Research Institute, Shenzhen 518131, China
- Beijing Computational Science Research Center, Beijing 100193, China
| | | | - ChiYung Yam
- Shenzhen JL Computational Science and Applied Research Institute, Shenzhen 518131, China
| | - Liujiang Zhou
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China
| | - Traian Dumitrică
- Department of Mechanical Engineering, University of Minnesota, Minnesota 55455, United States
| | - Thomas Frauenheim
- Shenzhen JL Computational Science and Applied Research Institute, Shenzhen 518131, China
- Beijing Computational Science Research Center, Beijing 100193, China
- Bremen Center for Computational Materials Science, University of Bremen, Bremen 2835, Germany
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10
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Ma L, Hamidinejad M, Zhao B, Liang C, Park CB. Layered Foam/Film Polymer Nanocomposites with Highly Efficient EMI Shielding Properties and Ultralow Reflection. NANO-MICRO LETTERS 2021; 14:19. [PMID: 34874495 PMCID: PMC8651911 DOI: 10.1007/s40820-021-00759-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Accepted: 10/10/2021] [Indexed: 05/21/2023]
Abstract
Lightweight, high-efficiency and low reflection electromagnetic interference (EMI) shielding polymer composites are greatly desired for addressing the challenge of ever-increasing electromagnetic pollution. Lightweight layered foam/film PVDF nanocomposites with efficient EMI shielding effectiveness and ultralow reflection power were fabricated by physical foaming. The unique layered foam/film structure was composed of PVDF/SiCnw/MXene (Ti3C2Tx) composite foam as absorption layer and highly conductive PVDF/MWCNT/GnPs composite film as a reflection layer. The foam layer with numerous heterogeneous interfaces developed between the SiC nanowires (SiCnw) and 2D MXene nanosheets imparted superior EM wave attenuation capability. Furthermore, the microcellular structure effectively tuned the impedance matching and prolonged the wave propagating path by internal scattering and multiple reflections. Meanwhile, the highly conductive PVDF/MWCNT/GnPs composite (~ 220 S m-1) exhibited superior reflectivity (R) of 0.95. The tailored structure in the layered foam/film PVDF nanocomposite exhibited an EMI SE of 32.6 dB and a low reflection bandwidth of 4 GHz (R < 0.1) over the Ku-band (12.4 - 18.0 GHz) at a thickness of 1.95 mm. A peak SER of 3.1 × 10-4 dB was obtained which corresponds to only 0.0022% reflection efficiency. In consequence, this study introduces a feasible approach to develop lightweight, high-efficiency EMI shielding materials with ultralow reflection for emerging applications.
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Affiliation(s)
- Li Ma
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, ON, M5S 3G8, Canada
| | - Mahdi Hamidinejad
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, ON, M5S 3G8, Canada
- Institute for Manufacturing, Department of Engineering, University of Cambridge, Cambridge, CB3 0FS, UK
| | - Biao Zhao
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, ON, M5S 3G8, Canada.
- Laboratory of Advanced Materials, Department of Materials Science, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200438, People's Republic of China.
- Henan Key Laboratory of Aeronautical Materials and Application Technology, School of Material Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou, Henan, 450046, People's Republic of China.
| | - Caiyun Liang
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, ON, M5S 3G8, Canada
- CAS Key Laboratory of High-Performance Synthetic Rubber and Its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, People's Republic of China
| | - Chul B Park
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, ON, M5S 3G8, Canada.
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11
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Tribological performances of hexagonal boron nitride nanosheets via surface modification with silane coupling agent. SN APPLIED SCIENCES 2021. [DOI: 10.1007/s42452-021-04390-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
AbstractHexagonal boron nitride (h-BN) is a promising lubricant additive for decreasing wear and friction. However, the poor dispersion stability and bulky size of h-BN restricted its lubrication application. In this paper, bulk h-BN was exfoliated into h-BN nanosheets (h-BNNSs), and then the self-made h-BNNSs were chemically modified with silane coupling agent via a facile and scalable reaction method. The morphology and structure of surface-functionalized h-BNNSs (m-BNNSs) were certified using a series of characterizations. Results revealed that h-BNNSs could be chemically well capped by surface modifier and the lipophilic groups were covalently attached to h-BNNSs surfaces. The m-BNNSs composite possessed long-term dispersion in liquid paraffin (LP). At the optimal adding content of 0.6 wt%, coefficient of friction and wear volume of m-BNNSs composite were decreased by about 31.9% and 53.8% compared with those of LP, respectively. Therefore, m-BNNSs composite as a lubricating oil additive has high research value and good prospects of lubrication applications.
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Zhao B, Li X, Zeng S, Wang R, Wang L, Che R, Zhang R, Park CB. Highly Compressible Polymer Composite Foams with Thermal Heating-Boosted Electromagnetic Wave Absorption Abilities. ACS APPLIED MATERIALS & INTERFACES 2020; 12:50793-50802. [PMID: 33119254 DOI: 10.1021/acsami.0c13081] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Polymer composite foams are desirable materials for electromagnetic (EM) energy attenuation. However, a number of challenges limit improvement in the EM energy attenuation properties of foams. In this study, a simple microcellular injection molding method was used to fabricate highly compressible thermoplastic urethane (TPU)/carbon nanotube (CNTs) composite foams, which also had increased conductivity with an increase in CNT content. Compared to unfoamed composites, foamed composites exhibited higher conductivity and EM attenuation properties because of the presence of a microcellular structure. Moreover, the TPU/CNT foam with 4 wt % CNTs (F(4)) demonstrated strong EM dissipation and an optimal reflection loss (RL) value of -30.4 dB. Furthermore, stimulated by thermal heating and cyclic compression, EM attenuation was observed to increase because of the higher conductivity. Note that F(4) foam having a small thickness of 1.3 mm when treated at 333 K had the highest EM dissipation and the lowest RL value of -51.8 dB. Enhanced polarization and ohmic losses and multiscattering were responsible for the increased EM absorption. This behavior is attributed to the movement of CNTs within the TPU elastomer walls via thermal or compression stimulation. For designing stimulation-dependent multifunctional materials, composite foams with response to thermal heating were proved to be an alternative approach.
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Affiliation(s)
- Biao Zhao
- Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, Shanghai 200438, P. R. China
- Henan Key Laboratory of Aeronautical Materials and Application Technology, School of Material Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou, Henan 450046, P. R. China
- Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto M5S 3G8, Canada
| | - Xiping Li
- College of Engineering, Zhejiang Normal University, Jinhua, Zhejiang 321004, P. R. China
| | - Shuiping Zeng
- College of Engineering, Zhejiang Normal University, Jinhua, Zhejiang 321004, P. R. China
| | - Ruoming Wang
- Henan Key Laboratory of Aeronautical Materials and Application Technology, School of Material Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou, Henan 450046, P. R. China
| | - Lei Wang
- Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, Shanghai 200438, P. R. China
| | - Renchao Che
- Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, Shanghai 200438, P. R. China
| | - Rui Zhang
- Henan Key Laboratory of Aeronautical Materials and Application Technology, School of Material Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou, Henan 450046, P. R. China
| | - Chul B Park
- Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto M5S 3G8, Canada
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Joy J, George E, Haritha P, Thomas S, Anas S. An overview of boron nitride based polymer nanocomposites. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20200507] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Jomon Joy
- School of Chemical Sciences Mahatma Gandhi University Kottayam Kerala India
| | - Elssa George
- School of Chemical Sciences Mahatma Gandhi University Kottayam Kerala India
| | - Prakashan Haritha
- School of Chemical Sciences Mahatma Gandhi University Kottayam Kerala India
| | - Sabu Thomas
- School of Chemical Sciences Mahatma Gandhi University Kottayam Kerala India
- International and Inter University Centre for Nanoscience and Nanotechnology Mahatma Gandhi University Kottayam Kerala India
| | - Saithalavi Anas
- School of Chemical Sciences Mahatma Gandhi University Kottayam Kerala India
- Advanced Molecular Materials Research Centre Mahatma Gandhi University Kottayam Kerala India
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